Statistics Class 9 Notes Maths - Chapter 14
Chapter: 14
What Are Statistics ?
Statistics is a branch of study that deals with the collection, presentation, analysis and interpretation of data.
Data
Facts or figures, collected with a definite purpose.
Graphical Representation Of Data
Bar Graphs, Histograms of uniform & varying widths and frequency polygons.
Raw Data
The data obtained in original form.
Grouped Data
The data given in the form of class interval such as 0–20, 20 – 40, and so on.
Class Size
Upper limit - Lower limit
Frequency
The number of times an observation or group observations occur.
Exclusive Form
Upper limit of the one class is lower limit of the next class.
Inclusive Form
Upper limit of the class is not same as lower limit of the next class.
Class Mark
(Lower limit+Upper limit/2)
